Piston pump



Sept 15, 1930- R. A. swAlNsoN 1,775,975

' PIsToN PUMP Filed Feb. 2, 1928 INVENTOR.

By Toulmin 8@ Toubmm ATTORNEYS.

Patented Sept. 16, 1930 UNITED STATES PTET FFICE ROBERT ALEXANDER SWAINSN, F NEWCASTLE-UPON-TYNE, ENGLAND, ASSIGNOR TO M. W. SWNBURNE AND SONS, LIMTED, 0F WALLSEND-ON-TYNE, ENGLAND rrsroiiv PUMP Application filed February 2, 1928, Serial No. 251,371, and in Great Britain February 9, 1927.

This invention relates to piston pumps, 'either double-acting or 'single-acting, and has for its object to provide an improved construction.

In a pump in accordance with my invention, the suction and delivery valves and their seats1 the dividing partitions, and the valve'chamber cover form a plug adapted to be inserted into and removed from the pump barrel as a unit, the arrangement being such that said plug constitutes one end of the pump barrel and is inserted into and removed from the barrel in an axial direction. Preferably the liner of thev pump barrel also forms a part of said removable plug, but, it desired, it may be a separate fitting or may be dispensed with. The plug is slightly tapered to make a tight joint without the use of packing, and is retained in position,

Y after insertion inthe barrel, by any convenient clamping device. In a doubleacting pump, the end of the barrelvremote from the valves communicates with one of the two 4valve chambers through a passage formed in the wall Vof the barrel. The suction and delivery valves may be of any convenient type, and the pump may be operated by hand or power.

Theaccompanying drawings illustrate a double-acting pump in accordance with my invention. In'the drawings, Figure l is a side elevation showing'the plug withdrawn from the pump barrel, Figure 2 is a central longitudinal section'with-the plug in posiv tion in the'barrel, and Figure 3 is a half vertical section through. the valve chamber anda half end elevation.

Referring to the drawings, in the eX- ample therein illustrated, the pump com- 4.0 prises a barrel a which is slightly tapered internally and is provided at its larger end with a suction inlet Z9 and` a delivery outlet Grand at its smaller end with a screwed plug cl for priming. p The larger end kof the barrel a is open,

and the other end is closed by a wall e providedeentrally with a gland 7 through which passes the pistonV rod g on which is mounted 'the piston it. The outer end of the pist-on rod J.50 is reduced and 4threaded at g1 and on it is mounted a block .7 which is retained by a uut (/2. The block ,7' has projecting pins jl which are journalled in the side walls k1 of a slot in a handlever /cfmounted on a pivot m carried by a pair of links n pivoted at al to the base a1 of the barrel a. Oscillation oft the lever about the pivot m reciprocates the piston ,7L in the barrel.

The open end of the barrel a forms a tapered valve chamber which receives a tapered plug comprising a valve chamber cover p, transverse partitions g, a central partition r perpendicular thereto, a disc s which forms the partition between the pump barrel and the valve chambers, and a cylindrical extension t `which forms a liner for the pump barrel within which the piston .7L reciprocates. llfhe peripheries of the cover c and partition s and the edges of the partitions g are tapered to correspond with the internal taper of the barrel a. The transverse partitions g carry the suction valves u and the delivery valves i) and the seats u1 and el therefor. The space between the partitions f] is divided into separate valve chambers by the partition r; the

chamber on one side of the partition r communicates through an aperture s1 in the partion 3 with the inner end of the barrel a, and the chamber on the other side of the partition r communicates through a passage a2 in the wall of the barrel a with the gland end of the barrel.

The cover p carries a locking device comprising a clamp w pivoted on a stud p1 mounted centrally of the cover. The clamp is formed with inturned projections w1 at its ends which coact with part spiral threads ,r1 on the exterior of the barrel a.

In operation, the plug having been inserted in the barrel a and locked therein by the clamp w, when the lever 7n is operated to move the piston 7L towards the partition s, liquid is drawn through the inlet I), the right-hand (Fig. 3) suction valve vu and the passage a2 into the barrel a behind the piston and is simultaneously forced through the aperture s1, the left-hand delivery valve o to the outlet c, and, when the piston is moved towards the gland 7, liquid is drawn through the inlet Zi, the left-hand suetionvalve aand the aper-` ture s1 into the barrel a andsimultaneoiisly the plugis facilitated by the threads m1 which Y withdrawal of theplug.' Then inserting the` `plug,"eorrect positioning is *l ensured bythe forced` through the "passage/0&2V and the righthand'deliveiy valve (v to the youtlet 0.y

-To dismantle l the pump for cleaning, the Clampett/VisV swungL round to disengage the i threads x and the 'plugl withdrawn from the barrel as shown in Ilig. l; The withdrawal of Coactwiththe projectionsl w1 to fstart' the registering of a semi-Cylindrical flange pf on theeover p withfa semi'cylindrical'extension .Y a3 ot the pump barrel a, The piston 'tcan'V be'removed by detachingthe nut'. ggfon the piston rodg, when the block j, eanbe ref are omitted, thepuni'p becomesk a .single-aet-y ing pump alternately drawing the liquid'intol vand ,delivering it' from the end of the barrel Anext the partitionsl through the aperture s?.

` suction' andY deliveryvalves.

rmovedv therefrom, 'and withdrawing the pis- A toni and its v rod from `the open lend of the pump barrel. o n s V:

While I have'fillustrated, by way ofexample, a' double-acting pump, itwill be seen that, if the passage a2 andthey partition r In this Case onlya-single pair of valvesV need befitted.` Instead of using `mushroom valves u and/11v as illustrated, 'I mayy employ ball, hinged flap or other]suitable, valves as ythe Myimprovedpump is particularly adapt;

higheflieieney yin operation sineefithas no Y, rel is Vsubjected:to .wearQfIt is especially suitable for iise where'. skilled attendantszare f jaiidfpistonfmay bel readily inspeetedby 'witli,k

not favailable`,vas the state of the valves,rliner 7' vdrawingfthe plug, and, nwhere a sparefplug and piston'are available, the ywhole of themterior "of the pun'ip eanbe renewed without' -thefuse of a single tool. Y j f Y Wliat-'I'elaim as my invention andV desire. ,l o y v 4 n t Y'-wdep'endentofthepiimpbarrel,'saidflinerbe-` 1* vtgliiier, asii'ction inlet to saidf barrel, a disf LV1. A piston puinpfeompylsing a pviini'ploai-,` rel, a c'liner therein, apiston in said liner,

to secure4` LettersPatent is -ineans` for reciprocating said piston inr said 'Charge outlet "tosaidrbarrehfa plug whichV can be inserted into and removed from Aone end of said .barrel'in an .axialidireetion as imit, said removable plug Comprising an end, 'Cover yand' longitudinal and transverse f par? VVtit-ions `forming a valvezclianiber independent y 'foriv retaining-said Y pumpbarrel;"` .Y A A t Vpiston"pump!Comprising aspump barofiftlie vpuin-p *barreL-suetion andgdelivery valves 'and their j vseats'lin said Lvalve ,Chamber A ea'i'fried-by said partitions,y a Communication f A y ffjbetweensfaid valve chamber,and-theinterioi .s of the'liiier inl-the pumpbarrehfandfmeans plug lin Vposition' inffthe charge outlett'o saidbarreha Vplug which Vtainingifsaid plug.; position-inthe pump Y and longitudinal" 'andftransverse :partitions r f crzvlnanribersy and the interiorv 'ofthe liner "in the 4 pump. barrel-leadingfrom the" other .valveflV 'hamberito the end of the"piiiipfbarrelrei mote romsaidvalve chamber-,fand Y Y yretainin saidfp'l ffm'eansl'rfor ree'iprc'ircyatinjg*"*saidfl piston 1inV said n linenaisiiotioninll 'ladiseharge f I Y inves/'5 L iel','a liner thereinfa piston in said liner, f

means Vforf.r'eciprocating saidpiston in said liner, a suction inlet to saidl barrel, a dis- Canbe insertedk into and removed from' one end off 'said barrel in'aniaxialidirection as Y Limia-'said removable plug' Comprising .an I

end cover land long gitudinaly and transverse partitions `l'formi'nga pair of separate valveg I chambers independent of Y the Apumpv barrel',

suctioiizand delivery valves'and' their'seats in eaehof said valve chambers carried'by said partitions, independent Communications between said valveoliambers Yand the interiorY Y ff ofthe liner inthe pump` barrel, andmeans vtor *retain-ing; said plug in f, position in t'hev p'umpvbarrel.V Y Y Y y A piston pump comprising afgpump barrel,a liner therein` api'stonin said liner, i

means lork reiprocatingsaid piston in said eliarge outlet tov .said` barrel, :ajplug which Y "1' y Vunit said removable; plugeomprisingan end cover and longitudinal and transverse par-4 titioiis, forming.a pair of separate valvei ',chambersindependentof the pump barrel," i n" .said .liner beingy Carried vby .said plug, suction and delivery valves and theirfseatsin each of 05'17 Y Y said valvehambers carried yby@saidparti-k y, e

tions, independent Communications: 'between "said valve chambersjand the interiori o-'the '3 .V ft' liner inthe pump'barrelgand'means for re- Y i i109... VL barrel. e Y y Y Y. f 4. A' piston 'pump kcomprisin-g apu'mpfbarv l rel,f'a s linery therein, a Vpiston in said A liner, means f for reiprocating ,said :piston` ,in said; liner, fa suction;inletjtosaid barrel, af ,dis-v` l charge oiitletto'said barrel,. aplug:which can A' be inserted intojand. removed' vfrom ,onefen'd i y l of said barrel inail axial direetionj asva unit, y saidiemovable.plugComprisinggaii fend-eo'ver` 11o formingapair' ofseparatevalyeehambersfinfY *"1" ingvcari'ied by said plug, siition'an'd delivery valves andvftheir'seatsffinfeaehlo'f*said valveY chambers Carried 'by said` ',partitions, inde-Y vrT1115 pendentY communica-tions between said:valveV pump barrel, fsaid communications comprisingy an :aperture iii .the transverse 'partition between-on'evalvelehamberand theiiiterior` l s 1 of said liner,"aiid afpassagein the wall ofthe barrel,"

ielyna 4linerxf'?therein, a .Y piste-nj` infsaidkfliner outlet to said barrel, plug which can be iuserted into and removed from one end ot said barrel in an axial direction as a unit, said removable plug` comprising an end cover and longitudinal and transverse partitions for1ning a pair of separate valve chambers inde pendent of the pump barrel, said liner being carried by said plug, suction and delivery valves and their seats in each ot said valve chambers carried by said partitions, independent communications between said valve chambers and the interior of the liner in the pump barrel, said communications comprising an aperture in the transverse partition between one valve chamber and the interior ot said liner, and a passage in the wall of the Cil pump barrel leading from the other valve chamber to the end of the pump barrel remote from said valve chamber, said' pump barrel being tapered and said plug being tapered to suit, and means for retaining said plug in position in the pump barrel.

6. A piston pump comprising a pump barrel, a liner therein, a piston in said liner, means for reciprocating said piston in said liner, a suction inlet to said barrel, a. discharge outlet to said barrel, a plug which can be inserted into and removed from one end o said barrel in an axial direction as a unit, said removable plug comprising an end cover and longitudinal and transverse partitions forming al pair of separate valve chambers independent of the pump barrel, said liner being carried by said plug, suction and delivery valves and their seats in each of said valve chambers carried by said partitions, independent communications between said valve chambers and the interior of the liner in the pump barrel, said communications comprising an aperture in the transverse partition Vbetween one valve chamber and the interior of saidliner, and a passage in the wall oi the pump barrel leading from the other valve Vchamber to the end of the pump barrel remote from said valve chamber, said pump barrel being tapered, and said plug being tapered to suit, and means for retaining said plug in position in the pump barrel, said means `comprising a rotatable clamp on said plug, inturned projections at the ends of said clamp, and parts spiral threads on the exterior of the pump barrel with which said in turned projections coact.

7. A piston pump comprising a pump barrel, a liner therein, a piston in said liner, means for reciprocating said piston in said liner, a suction inlet to said barrel, al discharge outlet to said barrel, a plug which can be inserted into and removed from one end of said barrel in an axial direction as a unit, said removable plug comprising an end cover and longitudinal and transverse partitions forming a pair of separate valve chambers independent or the pump barrel, said liner being carried by said plug, suction and delivery valves and their seats in each of said valve chambers carried by said partitions, independent communications between said valve chambers and the interior ot the liner in the pump barrel, said communications comprising an aperture in the transverse partition between one valve chamber and the interior of said liner, and a passage in the wall of the pump barrel leading from the other valve chamber to the end of the pump barrel remote from said valve chamber, said pump barrel being tapered, and said plug being tapered to suit, and means t'or retaining said plug iu position in the pump barrel, said means comprising a rotatable clamp on said plug, inturned projections at the ends of said clamp, and part spiral threads on the exterior o1 the pump barrel with which said inturned projections coact, and means for ensuring correct positioning of the plug in the pump barrel.

In testimony whereof, I aix mv signature.

ROBERT A. sWINsoN. 

